在 OpenGL 中的 2D 纹理顶部渲染一个带轮廓的红色矩形

I have followed these steps:
Modyifying the projection matrix stack and simulating a 2D scene

void COpenGLControl::OnSize(UINT nType, int cx, int cy)
{
wglMakeCurrent(hdc, hrc);
CWnd::OnSize(nType, cx, cy);

if (0 >= cx || 0 >= cy || nType == SIZE_MINIMIZED) return;
oglWindowWidth = cx;
oglWindowHeight = cy;
// Map the OpenGL coordinates.
glViewport(0, 0, oglWindowWidth, oglWindowHeight);

// Projection view
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
// Set our current view perspective
glOrtho(-oglWindowWidth/2, oglWindowWidth/2, -oglWindowHeight/2,oglWindowHeight/2, 1, -1);
// Model view
glMatrixMode(GL_MODELVIEW);
wglMakeCurrent(NULL, NULL);
}  

修改modelview矩阵栈和设置camera(好像我们在看z轴的负方向)

void COpenGLControl::OnDraw(CDC *pDC)
{
// TODO: Camera controls
wglMakeCurrent(hdc,hrc);
glLoadIdentity();
gluLookAt(0,0,1,0,0,0,0,1,0);
glTranslatef(m_fPosX, m_fPosY, 0.0f);
glScalef(m_fZoom,m_fZoom,1.0);
setViewRectangle();
if (WantToDrawRectangle)
    DrawRectangleOnTopOfTexture();
wglMakeCurrent(NULL, NULL);
}  

行 setViewRectangle() 用于计算 vectorViewRectangle 类的公共成员数据之一，如果用户需要，vector<;int>RectangleToDraw 其他公共成员数据将用于绘制矩形.这是因为我们不希望在大窗口中绘制这样的矩形，但在较小的窗口中我们会这样做.而较小的将使用较大的数据.但我还没有实现如何在一个类的两个实例之间实时传递这些数据！
因此，在尝试上课时，我将 RectangleToDraw 的初始值设置如下，并且由于窗口是 [0,0,573,543] 设置的 glOrtho，我认为应该在纹理顶部的中心绘制矩形.但事实并非如此.
反正
应用将在 OnTimer 中调用的纹理的代码

void COpenGLControl::oglDrawScene(void)
{
wglMakeCurrent(hdc, hrc);
float x0 = -ImageWidth/2; // top left corner of image
float y0 = ImageHeight/2;
float x1 = x0 + ImageWidth; // bottom right corner of image
float y1 = y0 - ImageHeight;

glBegin(GL_TRIANGLE_STRIP);
{
    glTexCoord2f(0,1);glVertex2f(x0, y1);
    glTexCoord2f(0,0);glVertex2f(x0, y0);
    glTexCoord2f(1,1);glVertex2f(x1, y1);
    glTexCoord2f(1,0);glVertex2f(x1, y0);
}
glEnd();
wglMakeCurrent(NULL, NULL);
}  

void COpenGLControl::setViewRectangle()
{
ViewRectangle.at(0) = m_fPosX - oglWindowWidth*m_fZoomInverse/2;
ViewRectangle.at(1) = m_fPosY - oglWindowHeight*m_fZoomInverse/2;
ViewRectangle.at(2) = m_fPosX + oglWindowWidth*m_fZoomInverse/2;
ViewRectangle.at(3) = m_fPosY + oglWindowHeight*m_fZoomInverse/2;
}  

void COpenGLControl::DrawRectangleOnTopOfTexture()
{
wglMakeCurrent(hdc, hrc);
glColor3f(1.0f,0.0f,0.0f);
glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
glBegin(GL_QUADS);
   glVertex3f(RectangleToDraw.at(0),RectangleToDraw.at(1),0.5);
   glVertex3f(RectangleToDraw.at(0),RectangleToDraw.at(3),0.5);
   glVertex3f(RectangleToDraw.at(2),RectangleToDraw.at(3),0.5);
   glVertex3f(RectangleToDraw.at(2),RectangleToDraw.at(1),0.5);
glEnd();
SwapBuffers(hdc);
wglMakeCurrent(NULL, NULL);
}  

WantToDrawRectangle = true;  
RectangleToDraw.at(0) = -100;
RectangleToDraw.at(1) = -100;
RectangleToDraw.at(2) = 100;
RectangleToDraw.at(3) = 100;  

glColor3f     (1.0f, 0.0f, 0.0f);
glBegin       (GL_LINE_LOOP);
   glVertex3f (RectangleToDraw.at (0), RectangleToDraw.at (1), -1.0f);
   glVertex3f (RectangleToDraw.at (0), RectangleToDraw.at (3), -1.0f);
   glVertex3f (RectangleToDraw.at (2), RectangleToDraw.at (3), -1.0f);
   glVertex3f (RectangleToDraw.at (2), RectangleToDraw.at (1), -1.0f);
glEnd         ();